Stent Graft Non-Overlapping Collapsed Configuration
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Solution Overview
Problem
Current stent graft delivery systems face challenges in advancing devices through small access vessels due to their large profile, making it difficult to treat aortic diseases like aneurysms and dissections effectively.
Innovation Solution
A low-profile stent graft system is developed, where the stent and graft are positioned in non-overlapping collapsed states within a delivery catheter, allowing for axial support and expansion within the vessel, enabling precise deployment and reduced obstruction during delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If stent graft delivery systems use traditional overlapping configurations, then structural support is maintained, but device profile becomes too large for small access vessels
Solution Approach 1:
The patent transitions from a traditional axial overlapping arrangement to a radial stacked arrangement where the stent and graft are positioned at different radial levels within the delivery catheter. This dimensional reconfiguration allows both components to coexist in a compact non-overlapping manner, reducing the overall device profile while maintaining structural integrity through their interconnected design.
2Volume of moving object
If stent and graft are positioned in non-overlapping positions, then delivery profile is reduced, but axial support and positioning become more challenging
Solution Approach 1:
The patent introduces connecting elements as intermediary structures that physically link the stent and graft components positioned at different radial levels. These connecting elements serve as mediators that transmit forces and maintain precise axial relationships between the separated components during delivery and deployment, ensuring accurate positioning without requiring the components to overlap.
3Length of moving object
If traditional delivery systems are used, then stent graft can be deployed, but navigation through small access vessels like iliac and femoral arteries is difficult
Solution Approach 1:
The patent employs a nested configuration where the stent and graft are arranged in a compact stacked manner within the delivery catheter, similar to nested dolls. This nesting approach minimizes the overall device dimensions, allowing the delivery system to navigate through small access vessels such as the iliac and femoral arteries that would be inaccessible to traditional bulkier delivery systems.
Data Source
AI summary
Some embodiments are directed to a deployment system for deploying a stent graft within a passageway, including a delivery catheter having an outer sheath, a proximal end, and a distal end, a stent having a first end and a second end, a graft having a first end and a second end, and at least one connecting element extending from the second end of the stent to the first end of the graft so as to connect the stent to the graft. In some embodiments, the stent can be supported within the outer sheath at a first axial position in a collapsed state, and the graft can be supported within the outer sheath at a second axial position different than the first axial position in a collapsed state, such that the stent does not overlap or substantially overlap the graft in the collapsed state within the deployment system.